1.范围1。1本标准描述了使用采样技术测定职业噪声暴露水平（Lex，T）的程序。Lex，T代表员工的长期噪声暴露。它是通过测量工作场所的等效声级（Leq，t）来计算的。本标准中的程序通常构成任何职业听力保护计划的一部分。本标准的使用者应精通噪声测量。1.2本标准提供了测量所有类型噪声（如连续噪声、纯音和脉冲噪声）的职业噪声暴露的程序。 所有类型的噪声（包括脉冲噪声）都是以能量相等的方式测量的。1.3本标准可用于测定个体（Lex，T）或具有类似噪声暴露的群体（LTRADE）的噪声暴露水平。它还可用于测量给定工作或活动（如操作特定机器）的噪声暴露（Leq，t）。1.4本标准规定了Leq，t（3 dB汇率）和（Lex，t）的计算。计算相关数量的程序，如Pa？h、 都提供了。 本标准也可用于测量LOSHA（5 dB汇率）和计算附录D中所示的相关指数。在这种情况下，结果可能无法很好地反映脉冲噪声的暴露情况。注:除非已知声级的时间分布，否则在Leq中进行的测量不能转换为LOSHA，反之亦然。1.5本标准提供了以给定精度确定员工噪声暴露水平的程序。在某些情况下，用户只对确定员工的暴露水平高于或低于标准水平感兴趣。 在这种情况下，当噪声暴露水平远高于或远低于标准水平时，可以放宽本标准中的程序。

1. Scope1.1This Standard describes procedures for the determination of the occupational noise exposure level (Lex,T) using sampling techniques. Lex,T represents the long-term noise exposure of employees. It is calculated from measurements of the equivalent sound level (Leq,t) in the workplace.The procedures in this Standard normally form part of any occupational hearing conservation program. The user of this Standard should be proficient in noise measurement.1.2This Standard provides procedures for measuring the occupation al noise exposure from all types of noise, eg, continuous noise, pure tones, and impulse noise. All types of noise (including impulse noise) are measured in terms of equal energy.1.3This Standard can be used for determination of the noise exposure level of individuals (Lex,T) or extended to groups (LTRADE) with similar noise exposures. It can also be used to measure the noise exposure (Leq,t) from a given job or activity (eg, operating a particular machine).1.4This Standard provides for measurements in terms of Leq,t (3 dB exchange rate) and calculation of (Lex,T). Procedures for calculating related quantities, such as Pa?h, are provided.This Standard may also be used for the measurement of LOSHA (5 dB exchange rate) and calculation of associated indices as shown in Appendix D. In this case, the results may not be a good representation of exposure to impulsive noise.Note:Measurements taken in Leq cannot be converted to LOSHA, or vice versa, unless the time distribution of sound levels is known.1.5This Standard provides procedures to determine the noise exposure level of employees with a given precision. In certain cases, the user is only interested in determining that an employee's exposure is above or below the criterion level. The procedures in this Standard can be relaxed in this case when the nois e exposure level is either far above or far below the criterion level.